Use safe_wraps for matmul (#4346)
Use safe_wraps for matmul (#4346)


ContinuumIO/dask,mrocklin/dask,dask/dask,jcrist/dask,jakirkham/dask,dask/dask,jakirkham/dask,blaze/dask,blaze/dask,mrocklin/dask,jcrist/dask,ContinuumIO/dask